US3543431A - Trolling depth control device - Google Patents

Trolling depth control device Download PDF

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US3543431A
US3543431A US3543431DA US3543431A US 3543431 A US3543431 A US 3543431A US 3543431D A US3543431D A US 3543431DA US 3543431 A US3543431 A US 3543431A
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vane
horizontal
towing
depth control
towed
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Philip David Olds
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Philip David Olds
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K91/00Lines
    • A01K91/06Apparatus on lines not otherwise provided for, e.g. automatic hookers
    • A01K91/08Trolling devices

Description

Dec. 1, 1970 110L135 3,543,431

TROLLING DEPTH CONTROL DEVICE Filed Feb. 23, 1968 2 Sheets-Sheet 1 INVENTOR. PHILIP D. OLDS ATTORNEYS.

Dec. 1, 1970 P. 0.01.05 3,543,431

TROLLING DEPTH CONTROL DEVICE Filed Feb. 23, 1968 2 Sheets-Sheet 2 INVENTOR. PHILIP D. OLDS BY ATTORNEYS.

Unitcd States Patent U.S. Cl 43-43.13 6 Claims ABSTRACT OF THE DISCLOSURE Trolling depth control device having a horizontal vane and an upstanding vane, the towing line being attached to the upstanding vane and the towed line to the horizontal vane, the vanes being of buoyant material but having a lead weight near the front end of the horizontal vane to impart a couple which acts to retain the device beneath the surface of water in which it is trolled, the couple however being overcome and reversed if extra drag (for example, due to a fish) is applied to the towed line, so that the device then moves to the surface.

This invention relates to a depth control device for use in trolling behind a boat.

Depth control devices have been proposed heretofore and these have included members having weighted forward ends, upstanding vanes and horizontal vanes, the towing line being secured to an upstanding vane towards its front end and the towed line being secured to the horizontal vane. (The terms upstanding and horizontal as used herein refer to the approximate position of vanes when being towed without debris or a fish on the towed line.) With this arrangement the weight ensures that the normally horizontal vanes will slope downwardly when the towing and towed lines are horizontal, but will eventually become substantially horizontal when the towing line slopes downwardly to the device. However, the existing type of trolling devices tend to sink, not being buoyant, and the depth at which they travel therefore increases considerably as the speed of the towing vessel decreases, and in sinking the device tends to become entangled with weed and debris at or near the floor of the sea.

The main object of this invention is to provide improvements whereby a trolling depth control device will have less tendency to sink but nevertheless will function satisfactorily at retaining a towed line below the water surface.

The invention may although not necessarily include as a feature a trolling depth control device having a horizontal vane and an upstanding vane both of buoyant material, the upstanding vane having towing line attachment means thereon and the horizontal vane having towed line attachment means thereon.

It will immediately be seen that it is possible to arrange the balance of buoyancy so that the center of buoyancy is disposed rearwardly of the attachment means for receiving the towing line, and this will then impart a moment of couple to the device about an axis normal to the direction of motion when it first enters the water tending to keep the vertical vane upstanding from the horizontal vane. Once the vane starts moving through the water it will tend to retain its initial angular position, that is, with the upstanding vane approximately vertical, owing to the moment of couple imparted by the towing line force and the moment of couple imparted by the towed line force lying in the plane of the upstanding vane (for a centrally located towed line).

Two embodiments of the invention are described hereafter in some detail with reefrence to and are illustrated in the accompanying drawings, in which:

3,543,431 Patented Dec. 1, 1970 FIG. 1 shows an equilibrium state of the device when being towed (without a fish or debris on the towed line).

FIG. 2 shows an equilibrium state of the device when a fish applies additional load to the towed line,

FIG. 3 is an elevation of a depth control device according to a first embodiment,

FIG. 4 is a plan of FIG. 3,

FIG. 5 is a perspective view showing a second embodiment wherein the upstanding vane can be varied relative to the horizontal vane, and

FIG. 6 is a central elevational section through the device of FIG. 5.

Referring first to the embodiment of FIGS. 3 and 4, a trolling depth control device 10 is provided with what is, for convenience, herein termed a horizontal vane 11 and an upstanding vane 12 unitary therewith. In this embodiment the material used is polypropylene which has a slight sponge formation so as to be buoyant. The edges of the vanes diverge rearwardly to provide a streamlined dart-shaped member capable of moving through water without imposing an excessive force to a towing line 13. This is important for sensitivity.

The upstanding vane 12 has a plurality of apertures 15 therein to constitute towing line attachment means, and the horizontal vane 11 is similarly provided with apertures 16 to constitute towed line attachment means.

A lead weight 18 is secured to the underside of the nose or leading end of the horizontal vane 11, and is conveniently adjusted for weight so that the device in its entirety will have approximately the same density as water, and threfore will not rapidly descend upon variation of speed.

The upper surface 19 of the horizontal vane 11 is of convex shape, and this assists in directing the nose downwardly for normal towing (FIG. 1) and upwardly when a fish is on the towed line (FIG. 2).

According to the second embodiment of FIGS. 5 and 6, the trolling depth control device 20 again comprises a horizontal vane 11 and an upstanding vane 12. The upstanding vane 1'2, however, is hinged to the horizontal vane about pin 21, near its front end, and screwed near its rear end, the screw 22 passing through a transverse slot 23 in the horizontal plane so that the upstanding vane can be positioned away from center, thus tending to throw the depth control device towards one side or the other of a towing vessel.

The shape of both the horizontal and vertical vanes are again of streamlined shape, both vanes being wider near their rear ends than near their front ends. As in the first embodiment, the weight 18 is screwed to the underside of the nose of the horizontal vane. The material of which the vanes are made is chosen to be of lower gravity than water, so that the rear end of the device will tend to float and so that the buoyancy center of the device is towards its rear end.

Forwardly of the buoyancy center of the device is disposed the plurality of apertures 15 through the vertical vane near its upper edge, these apertures being arranged to receive a towing line, while the apertures 16 in the horizontal vane 11 near its rear end are arranged to receive a towed line. The towing line attachment apertures 15 are a short distance above the towed line attachment apertures 16 but disposed forwardly thereof by a much greater distance. Under normal towing conditions therefor the towing line is nearly horizontal, having but a small upward slope, while the towed line is substantially horizontal. The resultant upward force is relatively small. However, the towed line apertures 16, in normally being lower than the towing line apertures 15, cause the vane 11 to adjust its position and the front end of the lure to dip downwardly. This causes a downward force on the vane 11 which will equal the resultant upward force for a stable tow condition. If moments of couple are considered about the towing point of the towing line, the weight on the nose multiplied by its distance forwardly of the towing point will cause an anticlockwise moment which is equalled by clockwise moment due to the downward force on the downwardly sloping vane 11 multiplied by the distance of its effective point of application rearwardly of the towing point. The device will resist any tendency to rotate over on its back so that it would then shoot to the surface, since such rotation would result in drawing the towed line forwardly and would lift the weight 18 up to a position similar to that shown in FIG. 2. However, when the additional loading of a fish, or debris on the towed line is transmitted to the device, the device will then have its equilibrium of forces upset, the force and moment arm dimension due to drag of the towed-line both being increased, while at the same time the angle of dip is decreased. This provides an unstable set of conditions corrected only by inversion of the device which results in its moving to the surface (FIG. 2).

This invention, though simple, provides a device which is effective in retaining a towed line at the desired depth but is sensitive to variation in drag of the towed line. It will be seen that since the device is little if any denser than water, it dose not tend to sink when way is lost, so that it will not so readily foul debris or weed at the floor of the sea or river in which it is to be used. Furthermore, it will be appreciated that the device is comprised of very low cost portions and therefore is cheaper than previously proposed devices. Furthermore, it will be seen that since the weight of the device is small, it is more responsive to changes of loading in the towed line, for example, due to a fish biting, and is therefore of more use to a sportsman.

What I claim is:

1. A trolling depth control device having a horizontal vane and an upstanding vane both of buoyant material, the edges of the horizontal vane diverging in a rearward direction, a weight on the underside of the horizontal vane near its front end, the upper edge of the upstanding vane diverging away from the horizontal vane in a rearward direction, a series of apertures through the upstanding vane near its upper edge, and a series of apertures through the horizontal vane near its rear end, the towing line attachment means being a short distance above the towed line attachment but a much greater distance forwardly of the towed line attachment means whereby moments of couple during towing are equal if the horizontal vane slopes downwardly towards its nose, but upon increase of loading on the towed line the moments of couple rotate the device to direct its nose upwardly.

2. A trolling depth control device as in claim 1 where said series of apertures through the upstanding vane are the towing line attachment means and said series of apertures through the horizontal vanes are the towed line attachment means, and said weight is positioned forwardly of said towing line attachment means.

3. A trolling depth control device as in claim 1 where said horizontal vane has an upper surface, in a no-extraload condition, of convex shape.

4. A trolling depth control device having a horizontal vane and an upstanding vane both of buoyant material, a weight on the underside of the horizontal vane near its front end, towing line attachment means on the upstanding vane, and towed line attachment means on the horizontal vane, the towing line attachment means being a short distance above the towed line attachment means but a much greater distance forwardly of the towed line attachment means whereby moments of couple about the towing point during towing are equal only if the horizontal vane slopes downwardly towards its nose, the effective said moments then being, in one direction, said weight multiplied by its distance forwardly of the towing point, and in the other direction, the downward force on the horizontal vane due to its passage through the water multiplied by its effective distance rearwardly of the towing point, but upon increase of loading on the towed line the moments of couple rotate the device to direct its nose upwardly.

5. A trolling depth control device according to claim 4 wherein the vanes are constituted by a unitary moulded member of resin-based thermoplastics material.

6. A trolling depth control device according to claim 4 wherein the upstanding vane is pivoted about a vertical axis to the horizontal vane thereby being adjustable relative thereto, and securing means between the vanes are operable to fix them relatively to one another in any one of a plurality of adjustable positions.

References Cited UNITED STATES PATENTS 1,875,122 8/1932 Olson 4342.5 2,731,755 1/1956 Ward et al 4343.13 2,924,907 2/ 1960 Hamilton 43-4313 2,940,207 6/1960 Scott 4343.13 3,032,912 5/1962 Bengtsson 43-43.13 3,135,065 6/1964 Cromoga 43--43.13 2,798,331 7/1957 Westdahl 43-43.13

SAMUEL KOREN, Primary Examiner D. J. LEACH, Assistant Examiner

US3543431D 1968-02-23 1968-02-23 Trolling depth control device Expired - Lifetime US3543431A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831308A (en) * 1972-09-07 1974-08-27 A Shaw Fishing line attachment
US4464858A (en) * 1982-05-20 1984-08-14 Wright Bill R Current cork
US4486970A (en) * 1976-08-31 1984-12-11 Wilfred Larson Trolling depth controller
US4745702A (en) * 1986-12-04 1988-05-24 Koch Alexander W Water-weighted diver, side planer, or side diver
US5020267A (en) * 1990-07-02 1991-06-04 Rasmussen Francis R Vortex diver
US5956889A (en) * 1997-09-22 1999-09-28 West; Michael Gene Hydroplaning airborne fishing device
US6453600B1 (en) 2000-12-13 2002-09-24 Henry A. Craig Fishing planer
US6658784B1 (en) * 2002-05-28 2003-12-09 Steven Mastropaolo Fishing lure
US20070261290A1 (en) * 2006-05-15 2007-11-15 Snowberger Cindy L Fishing diver
US20080172925A1 (en) * 2007-01-18 2008-07-24 Hazel Michael W Dive plane
US20100071251A1 (en) * 2008-09-19 2010-03-25 Kaeaeriaeinen Vesa Flasher
US8919033B2 (en) 2011-08-24 2014-12-30 Davis Fishing Technologies, Inc. Snagless bladed fishing lure
RU2692902C1 (en) * 2018-11-17 2019-06-28 Роберт Марварович Хакимов Fishing bait
US10477845B1 (en) 2018-07-10 2019-11-19 Blademan, Llc Snag-resistant fishing lure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1875122A (en) * 1931-06-30 1932-08-30 Oscar F Olson Fish lure
US2731755A (en) * 1953-03-27 1956-01-24 Roy A Ross Guide or lure for deep fishing
US2798331A (en) * 1952-06-30 1957-07-09 Sven A Westdahl Trolling float
US2924907A (en) * 1957-07-08 1960-02-16 Hamilton John Andrew Fishline attachment
US2940207A (en) * 1957-06-25 1960-06-14 John E Scott Trolling device
US3032912A (en) * 1957-07-20 1962-05-08 Bengtsson Sigurd Walter Devices for fish-tackles
US3135065A (en) * 1962-01-22 1964-06-02 Walter V Cromoga Trolling plane

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1875122A (en) * 1931-06-30 1932-08-30 Oscar F Olson Fish lure
US2798331A (en) * 1952-06-30 1957-07-09 Sven A Westdahl Trolling float
US2731755A (en) * 1953-03-27 1956-01-24 Roy A Ross Guide or lure for deep fishing
US2940207A (en) * 1957-06-25 1960-06-14 John E Scott Trolling device
US2924907A (en) * 1957-07-08 1960-02-16 Hamilton John Andrew Fishline attachment
US3032912A (en) * 1957-07-20 1962-05-08 Bengtsson Sigurd Walter Devices for fish-tackles
US3135065A (en) * 1962-01-22 1964-06-02 Walter V Cromoga Trolling plane

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831308A (en) * 1972-09-07 1974-08-27 A Shaw Fishing line attachment
US4486970A (en) * 1976-08-31 1984-12-11 Wilfred Larson Trolling depth controller
US4464858A (en) * 1982-05-20 1984-08-14 Wright Bill R Current cork
US4745702A (en) * 1986-12-04 1988-05-24 Koch Alexander W Water-weighted diver, side planer, or side diver
US5020267A (en) * 1990-07-02 1991-06-04 Rasmussen Francis R Vortex diver
US5956889A (en) * 1997-09-22 1999-09-28 West; Michael Gene Hydroplaning airborne fishing device
US6453600B1 (en) 2000-12-13 2002-09-24 Henry A. Craig Fishing planer
US6658784B1 (en) * 2002-05-28 2003-12-09 Steven Mastropaolo Fishing lure
US7444778B2 (en) * 2006-05-15 2008-11-04 Snowberger Cindy L Fishing diver
US20070261290A1 (en) * 2006-05-15 2007-11-15 Snowberger Cindy L Fishing diver
US20080172925A1 (en) * 2007-01-18 2008-07-24 Hazel Michael W Dive plane
US20100071251A1 (en) * 2008-09-19 2010-03-25 Kaeaeriaeinen Vesa Flasher
US8950106B2 (en) * 2008-09-19 2015-02-10 Vesa Kääriäinen Flasher
US8919033B2 (en) 2011-08-24 2014-12-30 Davis Fishing Technologies, Inc. Snagless bladed fishing lure
US10477845B1 (en) 2018-07-10 2019-11-19 Blademan, Llc Snag-resistant fishing lure
RU2692902C1 (en) * 2018-11-17 2019-06-28 Роберт Марварович Хакимов Fishing bait
WO2020101542A1 (en) * 2018-11-17 2020-05-22 Роберт Марварович ХАКИМОВ Fishing lure

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